In fact, Palpatine had another virtue.
When it came to fields he did not understand, he would let those who did handle them, giving them his full trust and support. And aside from the occasional time when the Dark Side Force went to his head, he generally did not indulge in micromanagement. Likewise, he would not pretend to understand things he did not, only to make a mess of them.
For instance, Palpatine knew absolutely nothing about military affairs, so he never meddled with fleet command, leaving it all to the marshals and generals under him.
For this very reason, back when he was still a Naboo Senator, he had already befriended many comrades and friends. After becoming Chancellor, he further supported them, allowing them to each perform their duties in every field.
Now that the Galactic Empire had been established, those former friends of his had all risen to prominence, contributing their respective strengths to the Empire from different posts and fields.
Take warship construction, for example. Palpatine generally did not interfere in specific matters, but he would still put forward certain demands—such as requiring enough firepower, or the ability to directly destroy a planet. Once he set the direction, he did not care how it was achieved. He only cared about the results.
Tang Xiao was actually the same kind of person. He also understood that every profession had its specialists, and likewise assigned fields he was not good at to others, rarely interfering himself.
Of course, even so, no one would ever describe these two evil Sith Lords as receptive to good advice.
There was a very important reason for this—they were both followers of the One-Man Sith ideal!
The so-called One-Man Sith did not mean gunning down everyone in the Milky Way Galaxy until only one